Alert archive / Colorado / Flash Flood Watches in 2015

Flash Flood Watch 1, NWS Goodland, KS

May 23, 2015Cheyenne County, Kansas; Kit Carson County, Yuma County, Colorado; Dundy County, Nebraska

NWS Goodland, KS issued this flash flood watch at May 23, 2015, 4:46 AM CDT for Cheyenne County, Kansas; Kit Carson County, Yuma County, Colorado; Dundy County, Nebraska. It took effect at May 23, 2015, 1:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
May 23, 2015, 4:46 AM CDT (09:46 UTC)
In effect from
May 23, 2015, 1:00 PM CDT
Expired
May 23, 2015, 10:23 PM CDT
In force
9 hr
Issued by
NWS Goodland, KS
Flood severity
None

Counties Kit Carson County, CO, Yuma County, CO, Cheyenne County, KS, Dundy County, NE

The radar

The Goodland radar (KGLD), 61 km from the middle of the area, began a volume at 09:46 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 9.8 hours before the alert went out and 96 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2015-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2015-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
23 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
959 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Goodland, KS wrote its last area forecast discussion before this flash flood watch went out at May 23, 4:24 AM CDT, 22 minutes earlier.

Area forecast discussion, May 23, 4:24 AM CDT, 22 minutes before
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Hazardous weather outlook, May 22, 12:04 PM CDT, 16 hours 42 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GOODLAND KS
1104 AM MDT FRI MAY 22 2015

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-231715-
YUMA-KIT CARSON-CHEYENNE CO-CHEYENNE KS-RAWLINS-DECATUR-NORTON-
SHERMAN-THOMAS-SHERIDAN-GRAHAM-WALLACE-LOGAN-GOVE-GREELEY-WICHITA-
DUNDY-HITCHCOCK-RED WILLOW-
1104 AM MDT FRI MAY 22 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL COLORADO...
EXTREME SOUTHWEST NEBRASKA AND NORTHWEST KANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SEVERE THUNDERSTORM MAY DEVELOP DURING THE AFTERNOON AND INTO THE
EVENING ACROSS EASTERN COLORADO WITH LARGE HAIL...DAMAGING
WINDS...AND ISOLATED TORNADOES POSSIBLE. THIS THUNDERSTORM
ACTIVITY WILL SPREAD NORTH AND EAST ACROSS NORTHWEST KANSAS AND
SOUTHWEST NEBRASKA LATE THIS EVENING AND OVERNIGHT WITH STRONG TO
SEVERE THUNDERSTORMS POSSIBLE. THE MAIN THREAT OVERNIGHT WILL BE
LARGE HAIL WITH ANY STRONGER STORMS THAT DEVELOP.

WIDESPREAD FOG IS EXPECTED OVERNIGHT WITH VISIBILITIES BELOW ONE
MILE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

FOG WILL BEGIN TO DISSIPATE SATURDAY MORNING...WITH VISIBILITIES
OF A HALF TO A QUARTER MILE WILL GRADUALLY IMPROVING BY MIDDAY.

SEVERE THUNDERSTORMS MAY CONTINUE EARLY SATURDAY MORNING OVER
PARTS OF NORTHWEST KANSAS AND SOUTHWEST NEBRASKA EAST OF HIGHWAY
27. DURING THE AFTERNOON A SECOND ROUND OF SEVERE WEATHER IS VERY
LIKELY...BEGINNING OVER EAST CENTRAL COLORADO AND SPREADING EAST
THROUGH THE AFTERNOON AND EVENING.

SUNDAY STRONG TO SEVERE STORMS MAY DEVELOP EAST OF THE COLORADO
BORDER.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 7:18 PM CDTSpecial Weather StatementGLDKit Carson27 min
May 22, 7:40 PM CDTSpecial Weather StatementGLDKit Carson50 min
May 22, 7:43 PM CDTFlash Flood WarningGLDKit Carson8 hr
May 22, 8:28 PM CDTSpecial Weather StatementGLDKit Carson17 min
May 22, 8:41 PM CDTSpecial Weather StatementGLDKit Carson34 min
May 22, 9:19 PM CDTFlash Flood WarningGLDKit Carson6 hr
May 22, 9:33 PM CDTSpecial Weather StatementGLDKit Carson27 min
May 23, 5:30 PM CDTSpecial Weather StatementGLDCheyenne30 min
May 23, 5:54 PM CDTSevere Thunderstorm WarningGLDCheyenne51 min
May 23, 5:59 PM CDTSpecial Weather StatementGLDKit Carson31 min
May 23, 6:24 PM CDTSpecial Weather StatementGLDCheyenne21 min
May 23, 6:38 PM CDTSpecial Weather StatementGLDKit Carson37 min
May 23, 6:42 PM CDTSpecial Weather StatementGLDCheyenne48 min
May 23, 6:54 PM CDTSpecial Weather StatementGLDYuma36 min

Nearby

Flash Flood Watches in Colorado, 2015Flash Flood Watches in Kansas, 2015Flash Flood Watches in Nebraska, 2015Every flash flood watch in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.